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Reportable Segments - Product Sales Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information
Sales to external customers	$ 321.1	$ 289.3
Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	83.3	77.4
Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	79.4	48.8
HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	17.3	13.6
Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	70.5	77.7
Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	51.3	51.5
Cryobiological storage
Segment Reporting Information
Sales to external customers	19.3	20.3
Operating Segments | D&S East
Segment Reporting Information
Sales to external customers	70.0	68.7
Operating Segments | D&S East | Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	0.0	0.0
Operating Segments | D&S East | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	19.7	12.1
Operating Segments | D&S East | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	0.0	0.0
Operating Segments | D&S East | Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	39.0	40.2
Operating Segments | D&S East | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	11.1	16.4
Operating Segments | D&S East | Cryobiological storage
Segment Reporting Information
Sales to external customers	0.2	0.0
Operating Segments | D&S West
Segment Reporting Information
Sales to external customers	111.6	118.0
Operating Segments | D&S West | Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	0.0	0.0
Operating Segments | D&S West | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	18.9	22.1
Operating Segments | D&S West | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	0.0	0.0
Operating Segments | D&S West | Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	32.4	37.8
Operating Segments | D&S West | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	41.1	36.1
Operating Segments | D&S West | Cryobiological storage
Segment Reporting Information
Sales to external customers	19.2	22.0
Operating Segments | E&C Cryogenics
Segment Reporting Information
Sales to external customers	62.2	35.1
Operating Segments | E&C Cryogenics | Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	21.6	25.9
Operating Segments | E&C Cryogenics | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	33.3	4.2
Operating Segments | E&C Cryogenics | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	7.3	5.0
Operating Segments | E&C Cryogenics | Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	0.0	0.0
Operating Segments | E&C Cryogenics | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	0.0	0.0
Operating Segments | E&C Cryogenics | Cryobiological storage
Segment Reporting Information
Sales to external customers	0.0	0.0
Operating Segments | E&C FinFans
Segment Reporting Information
Sales to external customers	80.7	70.5
Operating Segments | E&C FinFans | Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	62.0	51.5
Operating Segments | E&C FinFans | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	8.6	10.4
Operating Segments | E&C FinFans | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	10.1	8.6
Operating Segments | E&C FinFans | Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	0.0	0.0
Operating Segments | E&C FinFans | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	0.0	0.0
Operating Segments | E&C FinFans | Cryobiological storage
Segment Reporting Information
Sales to external customers	0.0	0.0
Intersegment Eliminations
Segment Reporting Information
Sales to external customers	(3.4)	(3.0)
Intersegment Eliminations | Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	(0.3)	0.0
Intersegment Eliminations | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	(1.1)	0.0
Intersegment Eliminations | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	(0.1)	0.0
Intersegment Eliminations | Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	(0.9)	(0.3)
Intersegment Eliminations | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	(0.9)	(1.0)
Intersegment Eliminations | Cryobiological storage
Segment Reporting Information
Sales to external customers	$ (0.1)	$ (1.7)

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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